Although old farmer Jakob Krämer insists he wants no form of celebration for his anniversary any more, he adults consider some party and Kajo takes charge of selecting a fit present, but the fitness apparatus he bought may prove too hard to set up safely. The kids are as delighted to play with another dog as Jakob is to get a visit from its boss, his old friend and partner in mischief Otto Fröhlich. The latter reminds Otto of a crazy promise they made a youths, and holds him to a race. Alas, Otto's old, faithful canine companion is found terminally ill, with slim chance to survive surgery.
—KGF Vissers